Abstract
The longitudinal and transverse impurity spin susceptibilities are expressed exactly in terms of holomorphic self-energies. Within thes-d model these self-energies are calculated in lowest order perturbation theory thus yielding reasonable approximations for the susceptibilities valid for all temperatures and magnetic fields above the Kondo regime and in the whole frequency domain including the hydrodynamical one. The transverse susceptibility and the longitudinal nuclear spin susceptibility are found to be satisfactorily described by Bloch's equations. In the low-temperature regime the longitudinal relaxation timeT 1 exhibits a nontrivial spin and temperature dependence. At low temperatures and high fields the longitudinal localized electron spin susceptibility is found to show a non-Lorentzian double-peak line shape which cannot be described by Bloch's equations.
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Götze, W., Wölfle, P. Dynamical impurity spin susceptibility in metals. J Low Temp Phys 5, 575–589 (1971). https://doi.org/10.1007/BF00628186
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DOI: https://doi.org/10.1007/BF00628186